Circular Wilson loops in defect conformal field theory

We study a D3-D5 system dual to a conformal field theory with a codimension-one defect that separates regions where the ranks of the gauge groups differ by k. With the help of this additional parameter, as observed by Nagasaki, Tanida and Yamaguchi, one can define a double scaling limit in which the quantum corrections are organized in powers of λ/k2, which should allow to extrapolate results between weak and strong coupling regimes. In particular we consider a radius R circular Wilson loop placed at a distance L, whose internal space orientation is given by an angle χ. We compute its vacuum expectation value and show that, in the double scaling limit and for small χ and small L/R, weak coupling results can be extrapolated to the strong coupling limit.Fil: Aguilera Damia, Jeremías. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; ArgentinaFil: Correa, Diego Hernán. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; ArgentinaFil: Giraldo Rivera, Victor Ivan. International Centre For Theoretical Sciences; India. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

Relaciones y conflictos sociales en clave de extractivismo. Un análisis desde la Institucionalidad colombiana

La importancia del sector de hidrocarburos para Colombia es altísima; por su desarrollo y posicionamiento ha generado recursos adicionales a las finanzas públicas departamentales por vía de regalías y recursos para el funcionamiento fiscal de la Nación. Sin embargo, debido a la explotación de hidrocarburos, se han generado conflictos sociales en dichos territorios, entre otras por incumplimientos a compromisos hechos con las comunidades por parte de las operadoras. Así mismo, actividades económicas tradicionales como la ganadería y el cultivo de arroz pasaron a lugares secundarios, lo que significó cambios muy rápidos en los patrones económicos, sociales y de infraestructura, aumento de precios de bienes de consumo e inmuebles y expectativas de empleo, entre otros. La presencia de industrias de capital y el modelo minero energético vigente, generan impactos estructurales en la sociedad y en las áreas en donde se extraen estos recursos, los efectos han sido evidenciados en estudios académicos, económicos y sociales. El objeto principal de este trabajo es identificar cuáles son las causas de estos impactos sociales y estructurales de la sociedad desde un análisis de la institucionalidad que se ha desarrollado alrededor de las industrias extractivas en el sector de hidrocarburos.The importance of the hydrocarbon sector for Colombia is very high; Due to its development and positioning, it has generated additional resources to the departmental public finances through royalties and resources for the fiscal operation of the Nation. However, due to the exploitation of hydrocarbons, social conflicts have been generated in these territories, among others due to non-compliance with commitments made with the communities by the operators. Likewise, traditional economic activities such as cattle ranching and rice cultivation moved to secondary places, which meant very rapid changes in economic, social and infrastructure patterns, increased prices of consumer goods and real estate and employment expectations, among others. The presence of capital industries and the current energy mining model generate structural impacts on society and in the areas where these resources are extracted, the effects have been evidenced in academic, economic and social studies. The main purpose of this work is to identify the causes of these social and structural impacts of society from an analysis of the institutional framework that has developed around the extractive industries in the hydrocarbon sector

Rugosidad superficial y potencia de corte en el cepillado de acacia Melanoxylon y Sequoia sempervirens

En el maquinado de madera, el cambio de las condiciones cinemáticas en el proceso de formación de viruta trae por consecuencia un cambio tanto en los esfuerzos de corte, como en el trabajo específico de corte, es decir, finalmente sobre la potencia de corte. Siendo en la práctica difícil hacer mediciones de esfuerzos de corte o de la energía específica en la línea de producción, el control de la potencia eléctrica de los motores es una realidad. El objetivo de esta investigación es evaluar el efecto del espesor medio de viruta sobre la potencia total de corte y la rugosidad resultante, y estimar el trabajo específico de corte en el proceso de cepillado para madera de Acacia melanoxylon (aromo) y Sequoia sempervirens (sequoia).Los resultados indicaron una buena correlación entre la potencia de corte y el espesor de viruta, requiriéndose mayor potencia de corte al incrementar la velocidad de avance del material. En cuanto a los resultados de rugosidad superficial, estos reflejaron los cambios del espesor de viruta. Además se obtuvo una mejor calidad superficial con la especie de mayor densidad. AbstractIn wood machining, the chip formation process consequently brings a change in cutting forces, as well in the specific cutting energy, i.e., finally on the cutting power. Being in practice difficult the measure of cutting forces or the specific energy at the production line, monitoring the electrical output of the power unit is a reality. The aim of this research is to evaluate the change of the mean chip thickness over cutting power and the resulting surface roughness, estimating the specific cutting work on planing process for blackwood and redwood samples.The findings lead to conclude a good correlation between cutting power and chip thickness, requiring the cutting process more power when more feed speed is applied. For the surface roughness, the results presented changes with the chip thickness, and a better surface quality was found with the dense blackwood lumber

Semiclassical partition function for strings dual to Wilson loops with small cusps in ABJM

We compute the 1-loop partition function for strings in AdS4 × ℂℙ3, whose worldsheets end along a line with small cusp angles in the boundary of AdS. We obtain these 1-loop results in terms of the vacuum energy for on-shell modes. Our results verify the proposal by Lewkowycz and Maldacena in arXiv:1312.5682 for the exact Bremsstrahlung function up to the next to leading order in the strong coupling expansion. The agreement is observed for cusps distorting either the 1/2 BPS or the 1/6 BPS Wilson line.Instituto de Física La Plat

Circular Wilson loops in defect conformal field theory

We study a D3-D5 system dual to a conformal field theory with a codimension-one defect that separates regions where the ranks of the gauge groups differ by k. With the help of this additional parameter, as observed by Nagasaki, Tanida and Yamaguchi, one can define a double scaling limit in which the quantum corrections are organized in powers of λ/k2, which should allow to extrapolate results between weak and strong coupling regimes. In particular we consider a radius R circular Wilson loop placed at a distance L, whose internal space orientation is given by an angle χ. We compute its vacuum expectation value and show that, in the double scaling limit and for small χ and small L/R, weak coupling results can be extrapolated to the strong coupling limit.Instituto de Física La Plat

Mas allá del territorio está el conflicto: reflexiones en clave de extractivismo

Esta reflexión partió del análisis de los conceptos de territorio, conflictos ecoterritoriales y violencia simbólica desde la perspectiva de diferentes autores. Desde la perspectiva de Harvey, se retoma la relación entre cuerpo, género y territorio; a partir de Bourdieu se vincula el concepto de violencia simbólica y sus relaciones, y desde Foucault se revisa el análisis sobre el sujeto y el poder. La metodología incluye una búsqueda documental orientada a realizar un análisis relacional de esos conceptos, partiendo de categorías de observación: el cuerpo, el género y el territorio, el habitus y la violencia simbólica, el cuerpo/territorio y el extractivismo y los espacios de esperanza. El desarrollo del estudio permitió establecer el estrecho vínculo existente entre las categorías seleccionadas, el modelo capitalista del extractivismo y como este afecta la construcción subjetiva del territorio

Semiclassical partition function for strings dual to Wilson loops with small cusps in ABJM

We compute the 1-loop partition function for strings in AdS4 × ℂℙ3, whose worldsheets end along a line with small cusp angles in the boundary of AdS. We obtain these 1-loop results in terms of the vacuum energy for on-shell modes. Our results verify the proposal by Lewkowycz and Maldacena in arXiv:1312.5682 for the exact Bremsstrahlung function up to the next to leading order in the strong coupling expansion. The agreement is observed for cusps distorting either the 1/2 BPS or the 1/6 BPS Wilson line.Instituto de Física La Plat

Circular Wilson loops in defect conformal field theory

We study a D3-D5 system dual to a conformal field theory with a codimension-one defect that separates regions where the ranks of the gauge groups differ by k. With the help of this additional parameter, as observed by Nagasaki, Tanida and Yamaguchi, one can define a double scaling limit in which the quantum corrections are organized in powers of λ/k2, which should allow to extrapolate results between weak and strong coupling regimes. In particular we consider a radius R circular Wilson loop placed at a distance L, whose internal space orientation is given by an angle χ. We compute its vacuum expectation value and show that, in the double scaling limit and for small χ and small L/R, weak coupling results can be extrapolated to the strong coupling limit.Instituto de Física La Plat

Strings in bubbling geometries and dual Wilson loop correlators

We consider a fundamental string in a bubbling geometry of arbitrary genus dual to a half-supersymmetric Wilson loop in a general large representation R of the SU(N) gauge group in N= 4 Supersymmetric Yang-Mills. We demonstrate, under some mild conditions, that the minimum value of the string classical action for a bubbling geometry of arbitrary genus precisely matches the correlator of a Wilson loop in the fundamental representation and one in a general large representation. We work out the case in which the large representation is given by a rectangular Young tableau, corresponding to a genus one bubbling geometry, explicitly. We also present explicit results in the field theory for a correlator of two Wilson loops: a large one in an arbitrary representation and a “small” one in the fundamental, totally symmetric or totally antisymmetric representation.Instituto de Física La Plat

Strings in bubbling geometries and dual wilson loop correlators

We consider a fundamental string in a bubbling geometry of arbitrary genus dual to a half-supersymmetric Wilson loop in a general large representation R of the SU(N) gauge group in N = 4 Supersymmetric Yang-Mills. We demonstrate, under some mild conditions, that the minimum value of the string classical action for a bubbling geometry of arbitrary genus precisely matches the correlator of a Wilson loop in the fundamental representation and one in a general large representation. We work out the case in which the large representation is given by a rectangular Young tableau, corresponding to a genus one bubbling geometry, explicitly. We also present explicit results in the field theory for a correlator of two Wilson loops: a large one in an arbitrary representation and a “small” one in the fundamental, totally symmetric or totally antisymmetric representation.Facultad de Ciencias Exacta